Heating apparatus



FIG. 1 is a front perspective view of the heating apparatus showing our design;

FIG. 2 is a left side elevational view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a bottom plan view thereof;

FIG. 5 is a right side elevational view thereof;

FIG. 6 is a rear elevational view thereof; and,

FIG. 7 is a front elevational view thereof.

The broken lines in FIGS. 1, 2, and 3 show portions of the heating apparatus that form no part of the claimed design. 

CLAIM The ornamental design for a heating apparatus, as shown and described. 